标签:des repos ice oid .exe jar 类型 gap base
本文主要介绍spring aop中9种切入点表达式的写法
https://gitee.com/likun_557/spring-aop-demo
execution(public * *(..))
execution(* set*(..))
execution(* com.xyz.service.AccountService.*(..))
拦截AccountService(类、接口)中定义的所有方法
execution(* com.xyz.service.*.*(..))
拦截com.xyz.service包中所有类中任意方法,不包含子包中的类
execution(* com.xyz.service..*.*(..))
拦截com.xyz.service包或者子包中定义的所有方法
表达式格式:包名.* 或者 包名..*
within(com.xyz.service.*)
拦截service包中任意类的任意方法
within(com.xyz.service..*)
拦截service包及子包中任意类的任意方法
目标对象使用aop之后生成的代理对象必须是指定的类型才会被拦截,注意是目标对象被代理之后生成的代理对象和指定的类型匹配才会被拦截
this(com.xyz.service.AccountService)
this表达式的使用,可能不是很好理解,用示例说明一下:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.ms</groupId>
<artifactId>spring-aop-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-aop-demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
package com.ms.aop.jthis.demo1;
public interface IService {
void m1();
}
package com.ms.aop.jthis.demo1;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
@Slf4j
@Component
public class ServiceImpl implements IService {
@Override
public void m1() {
log.info("切入点this测试!");
}
}
package com.ms.aop.jthis.demo1;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
@Aspect
@Component
@Slf4j
public class Interceptor1 {
@Pointcut("this(com.ms.aop.jthis.demo1.ServiceImpl)")
public void pointcut() {
}
@Around("pointcut()")
public Object invoke(ProceedingJoinPoint invocation) throws Throwable {
log.info("方法执行之前");
Object result = invocation.proceed();
log.info("方法执行完毕");
return result;
}
}
package com.ms.aop.jthis.demo1;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
@ComponentScan(basePackageClasses = {Client.class})
@EnableAspectJAutoProxy
@Slf4j
public class Client {
public static void main(String[] args) {
AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext(Client.class);
IService service = annotationConfigApplicationContext.getBean(IService.class);
service.m1();
log.info("{}", service instanceof ServiceImpl);
}
}
执行结果
10:27:12.277 [main] INFO com.ms.aop.jthis.demo1.ServiceImpl - 切入点this测试!
10:27:12.277 [main] INFO com.ms.aop.jthis.demo1.Client - false
@EnableAspectJAutoProxy:表示若spring创建的对象如果实现了接口,默认使用jdk动态代理,如果没有实现接口,使用cglib创建代理对象
所以 service 是使用jdk动态代理生成的对象,service instanceof ServiceImpl 为 false
@Pointcut("this(com.ms.aop.jthis.demo1.ServiceImpl)")表示被spring代理之后生成的对象必须为com.ms.aop.jthis.demo1.ServiceImpl才会被拦截,但是service不是ServiceImpl类型的对象了,所以不会被拦截
修改代码
@EnableAspectJAutoProxy(proxyTargetClass = true)
proxyTargetClass=true表示使用cglib来生成代理对象
执行结果:
10:34:50.736 [main] INFO com.ms.aop.jthis.demo1.Interceptor1 - 方法执行之前
10:34:50.755 [main] INFO com.ms.aop.jthis.demo1.ServiceImpl - 切入点this测试!
10:34:50.756 [main] INFO com.ms.aop.jthis.demo1.Interceptor1 - 方法执行完毕
10:34:50.756 [main] INFO com.ms.aop.jthis.demo1.Client - true
service 为 ServiceImpl类型的对象,所以会被拦截
target(com.xyz.service.AccountService)
目标对象为AccountService类型的会被代理
package com.ms.aop.target;
public interface IService {
void m1();
}
package com.ms.aop.target;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
@Slf4j
@Component
public class ServiceImpl implements IService {
@Override
public void m1() {
log.info("切入点target测试!");
}
}
package com.ms.aop.target;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
@Aspect
@Component
@Slf4j
public class Interceptor1 {
@Pointcut("target(com.ms.aop.target.ServiceImpl)")
public void pointcut() {
}
@Around("pointcut()")
public Object invoke(ProceedingJoinPoint invocation) throws Throwable {
log.info("方法执行之前");
Object result = invocation.proceed();
log.info("方法执行完毕");
return result;
}
}
package com.ms.aop.target;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
@ComponentScan(basePackageClasses = {Client.class})
@EnableAspectJAutoProxy
public class Client {
public static void main(String[] args) {
AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext(Client.class);
IService service = annotationConfigApplicationContext.getBean(IService.class);
service.m1();
}
}
执行结果:
10:49:01.674 [main] INFO com.ms.aop.target.Interceptor1 - 方法执行之前
10:49:01.674 [main] INFO com.ms.aop.target.ServiceImpl - 切入点target测试!
10:49:01.674 [main] INFO com.ms.aop.target.Interceptor1 - 方法执行完毕
@Pointcut("args(com.ms.aop.args.demo1.UserModel)")
匹配只有一个参数,且类型为com.ms.aop.args.demo1.UserModel
args(type1,type2,typeN)
@Pointcut("args(com.ms.aop.args.demo1.UserModel,..)")
匹配第一个参数类型为com.ms.aop.args.demo1.UserModel的所有方法,
..
表示任意个参数
@target(com.ms.aop.jtarget.Annotation1)
目标对象中包含com.ms.aop.jtarget.Annotation1注解,调用该目标对象的任意方法都会被拦截
@within(com.ms.aop.jwithin.Annotation1)
声明有com.ms.aop.jwithin.Annotation1注解的类中的所有方法都会被拦截
@target(注解A):判断被调用的目标对象中是否声明了注解A,如果有,会被拦截
@within(注解A): 判断被调用的方法所属的类中是否声明了注解A,如果有,会被拦截
@target关注的是被调用的对象,@within关注的是调用的方法所在的类
@annotation(com.ms.aop.jannotation.demo2.Annotation1)
被调用的方法包含指定的注解
注意:是方法参数所属的类型上有指定的注解,不是方法参数中有注解
@args(com.ms.aop.jargs.demo1.Anno1)
@args(com.ms.aop.jargs.demo1.Anno1,com.ms.aop.jargs.demo1.Anno2)
@args(com.ms.aop.jargs.demo2.Anno1,..)
标签:des repos ice oid .exe jar 类型 gap base
原文地址:https://www.cnblogs.com/itsoku123/p/10744244.html